[Python-porting] future newdict kwargs result in bytes

[Buck Golemon]

As I understand it, the contract of future.builtins is to act like the
python3 builtins, but this behavior is distinctly python2-ish (and
necessitates me to write my own `udict`).

>>> dict
<class 'future.builtins.types.newdict.newdict'>
>>> type(tuple(dict(a=1).keys())[0]).mro()
[<type 'str'>, <type 'basestring'>, <type 'object'>]
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